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One field of increasing interest where recycled materials are used is the manufacture of high-tenacity packaging stripes, and monofilaments. In both cases, the initial raw material is a mainly recycled material of higher intrinsic viscosity. High-tenacity packaging stripes as well as monofilament are then manufactured in the melt spinning process.
In many countries PET bottles are recycled to a substantial degree, [60] for example about 75% in Switzerland. [62] The term rPET is commonly used to describe the recycled material, though it is also referred to as R-PET or post-consumer PET (POSTC-PET). [63] [64] The prime uses for recycled PET are polyester fiber, strapping, and non-food ...
The reaction proceeds differently in acidic or alkaline conditions, but works best at temperatures between 200 and 300 °C. Under environmental conditions the process is undetectably slow. [7] PET is considered to be essentially non-biodegradable, with plastic bottles estimated to take as long as 450 years to decompose. [8]
In open-loop recycling, also known as secondary recycling, or downcycling, the quality of the plastic is reduced each time it is recycled, so that the material eventually becomes unrecyclable. It is the most common type. [97] Recycling PET bottles into fleece or other fibres is a common example, and accounts for the majority of PET recycling. [100]
Plastic was invented in the nineteenth century and was originally used to replace common materials such as ivory, rubber, and shellac. [4] Plastic bottles were first used commercially in 1947, but remained relatively expensive until the early 1950s when high-density polyethylene was introduced. [5]
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Use of food contact materials is required: potential food contamination is prohibited. Strict standards of cleanliness and processing must be followed. The most common material in milk packaging is high density polyethylene (HDPE), recycling code 2. Low density polyethylene (LDPE) and polyester (PET) [1] are also in use.
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